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Groups > linux.debian.user > #180939 > unrolled thread

How to run Debian from SD card but booting from USB stick?

Started byBłażej Popławski <blazejpop@wp.pl>
First post2017-05-11 22:50 +0200
Last post2017-05-13 14:30 +0200
Articles 8 on this page of 28 — 8 participants

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  How to run Debian from SD card but booting from USB stick? Błażej Popławski <blazejpop@wp.pl> - 2017-05-11 22:50 +0200
    Re: How to run Debian from SD card but booting from USB stick? Richard Owlett <rowlett@cloud85.net> - 2017-05-11 23:00 +0200
      Re: How to run Debian from SD card but booting from USB stick? Lisi Reisz <lisi.reisz@gmail.com> - 2017-05-12 01:00 +0200
        Re: How to run Debian from SD card but booting from USB stick? Ben Caradoc-Davies <ben@transient.nz> - 2017-05-12 01:20 +0200
      Re: How to run Debian from SD card but booting from USB stick? Brian <ad44@cityscape.co.uk> - 2017-05-12 02:10 +0200
        Re: How to run Debian from SD card but booting from USB stick? Brian <ad44@cityscape.co.uk> - 2017-05-12 14:50 +0200
      Re: How to run Debian from SD card but booting from USB stick? David Wright <deblis@lionunicorn.co.uk> - 2017-05-12 02:40 +0200
      Re: How to run Debian from SD card but booting from USB stick? Richard Owlett <rowlett@cloud85.net> - 2017-05-12 16:10 +0200
        Re: How to run Debian from SD card but booting from USB stick? Brian <ad44@cityscape.co.uk> - 2017-05-13 12:00 +0200
          Re: How to run Debian from SD card but booting from USB stick? Richard Owlett <rowlett@cloud85.net> - 2017-05-13 12:40 +0200
            Re: How to run Debian from SD card but booting from USB stick? Brian <ad44@cityscape.co.uk> - 2017-05-13 14:30 +0200
              Re: How to run Debian from SD card but booting from USB stick? Błażej Popławski <blazejpop@wp.pl> - 2017-05-14 10:20 +0200
        Re: How to run Debian from SD card but booting from USB stick? Błażej Popławski <blazejpop@wp.pl> - 2017-05-13 13:10 +0200
          Re: How to run Debian from SD card but booting from USB stick? Pascal Hambourg <pascal@plouf.fr.eu.org> - 2017-05-13 13:30 +0200
          Re: How to run Debian from SD card but booting from USB stick? Brian <ad44@cityscape.co.uk> - 2017-05-13 20:50 +0200
            Re: How to run Debian from SD card but booting from USB stick? Błażej Popławski <blazejpop@wp.pl> - 2017-05-14 10:20 +0200
              Re: How to run Debian from SD card but booting from USB stick? deloptes <deloptes@gmail.com> - 2017-05-15 09:00 +0200
    Re: How to run Debian from SD card but booting from USB stick? deloptes <deloptes@gmail.com> - 2017-05-11 23:10 +0200
      Re: How to run Debian from SD card but booting from USB stick? Brian <ad44@cityscape.co.uk> - 2017-05-12 15:00 +0200
        Re: How to run Debian from SD card but booting from USB stick? deloptes <deloptes@gmail.com> - 2017-05-12 19:40 +0200
          Re: How to run Debian from SD card but booting from USB stick? Brian <ad44@cityscape.co.uk> - 2017-05-12 21:30 +0200
            Re: How to run Debian from SD card but booting from USB stick? Richard Owlett <rowlett@cloud85.net> - 2017-05-12 21:50 +0200
            Re: How to run Debian from SD card but booting from USB stick? deloptes <deloptes@gmail.com> - 2017-05-12 23:40 +0200
              Re: How to run Debian from SD card but booting from USB stick? Brian <ad44@cityscape.co.uk> - 2017-05-13 12:00 +0200
                Re: How to run Debian from SD card but booting from USB stick? Pascal Hambourg <pascal@plouf.fr.eu.org> - 2017-05-13 12:40 +0200
                  Re: How to run Debian from SD card but booting from USB stick? Brian <ad44@cityscape.co.uk> - 2017-05-13 14:20 +0200
                Re: How to run Debian from SD card but booting from USB stick? deloptes <deloptes@gmail.com> - 2017-05-13 14:10 +0200
                  Re: How to run Debian from SD card but booting from USB stick? Brian <ad44@cityscape.co.uk> - 2017-05-13 14:30 +0200

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#180957

FromBrian <ad44@cityscape.co.uk>
Date2017-05-12 21:30 +0200
Message-ID<tGoqd-PR-15@gated-at.bofh.it>
In reply to#180955
On Fri 12 May 2017 at 19:31:16 +0200, deloptes wrote:

> Brian wrote:
> 
> > Would creating an initrd really be necessary?
> 
> Using stock kernel in most cases yes. Using custom kernel, you can compile
> the modules in and won't need initrd.

Richard Owlett accomplished it without anything special as regards an
initrd. His installation to the SD device was from a straight up-and-up
installer. It is very, very doubtful that the initrd on his HD had been
customised. Details at

  https://lists.debian.org/debian-user/2017/04/msg00329.html

So, the question remains. Is creating an initrd on Debian really necessary?

-- 
Brian.

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#180958

FromRichard Owlett <rowlett@cloud85.net>
Date2017-05-12 21:50 +0200
Message-ID<tGoJA-YD-7@gated-at.bofh.it>
In reply to#180957
On 05/12/2017 02:27 PM, Brian wrote:
> On Fri 12 May 2017 at 19:31:16 +0200, deloptes wrote:
>
>> Brian wrote:
>>
>>> Would creating an initrd really be necessary?
>>
>> Using stock kernel in most cases yes. Using custom kernel, you can compile
>> the modules in and won't need initrd.
>
> Richard Owlett accomplished it without anything special as regards an
> initrd. His installation to the SD device was from a straight up-and-up
> installer. It is very, very doubtful that the initrd on his HD had been
> customised. Details at
>
>   https://lists.debian.org/debian-user/2017/04/msg00329.html
>
> So, the question remains. Is creating an initrd on Debian really necessary?
>

For environment clarification *ONLY*
I had transferred contents of DVD 1 of 13 to a flash drive.
I then chose that "dvd" as my 'boot device'
    PLEASE note usage of ' and "

There is much happening that comfuzezes me ;/

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#180963

Fromdeloptes <deloptes@gmail.com>
Date2017-05-12 23:40 +0200
Message-ID<tGqs1-2k3-7@gated-at.bofh.it>
In reply to#180957
Brian wrote:

> So, the question remains. Is creating an initrd on Debian really
> necessary?

I am not at 100% sure, but AFAIK when you install the kernel mkinitramfs or
update-initramfs would add the modules already used by the kernel at the
moment of creation of the initrd. This could explain a lot.

As I explained before it is not possible to mount the root fs thus pass the
boot process to init/systemd if you don't have the proper driver(s). If the
drivers are included in the initrd it would boot ok, if not you are offered
the limitted shell. So again initrd is needed unless you have the drivers
compiled in the kernel. You can try this .. just remove the initrd line
when you boot

regards

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#180968

FromBrian <ad44@cityscape.co.uk>
Date2017-05-13 12:00 +0200
Message-ID<tGC0a-1Vi-37@gated-at.bofh.it>
In reply to#180963
On Fri 12 May 2017 at 23:34:05 +0200, deloptes wrote:

> Brian wrote:
> 
> > So, the question remains. Is creating an initrd on Debian really
> > necessary?
> 
> I am not at 100% sure, but AFAIK when you install the kernel mkinitramfs or
> update-initramfs would add the modules already used by the kernel at the
> moment of creation of the initrd. This could explain a lot.
> 
> As I explained before it is not possible to mount the root fs thus pass the
> boot process to init/systemd if you don't have the proper driver(s). If the
> drivers are included in the initrd it would boot ok, if not you are offered
> the limitted shell. So again initrd is needed unless you have the drivers
> compiled in the kernel. You can try this .. just remove the initrd line
> when you boot

The OP wonders if

  https://help.ubuntu.com/community/BootFromSD

it will work for Debian. The answer is "probably" but it is questionable
whether the advice to alter the initrd on the SD card need be followed.
Perhaps it was necessary for the Ubuntu kernel at the time the article
was written. The hardware involved would have to be known to more
definitive.

Debian would need to be installed to the SD card and the *same" Debian
installed to the USB stick. lsinitramfs will help confirm whether needed
modules are in an initrd.

-- 
Brian.

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#180970

FromPascal Hambourg <pascal@plouf.fr.eu.org>
Date2017-05-13 12:40 +0200
Message-ID<tGCCS-2pX-13@gated-at.bofh.it>
In reply to#180968
Le 13/05/2017 à 11:56, Brian a écrit :
>
> The OP wonders if
>
>   https://help.ubuntu.com/community/BootFromSD
>
> it will work for Debian. The answer is "probably" but it is questionable
> whether the advice to alter the initrd on the SD card need be followed.
> Perhaps it was necessary for the Ubuntu kernel at the time the article
> was written.

Not the kernel, but the default initramfs.
I seem to remember reading a recent post reporting that a SD/MMC driver 
was missing in the default Debian initramfs.

> Debian would need to be installed to the SD card and the *same" Debian
> installed to the USB stick.

Debian does not need to be installed on the USB stick. Only /boot and 
the boot loader.

> lsinitramfs will help confirm whether needed modules are in an initrd.

Yup.

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#180976

FromBrian <ad44@cityscape.co.uk>
Date2017-05-13 14:20 +0200
Message-ID<tGEbD-3vw-11@gated-at.bofh.it>
In reply to#180970
On Sat 13 May 2017 at 12:33:38 +0200, Pascal Hambourg wrote:

> Le 13/05/2017 à 11:56, Brian a écrit :
> >
> >The OP wonders if
> >
> >  https://help.ubuntu.com/community/BootFromSD
> >
> >it will work for Debian. The answer is "probably" but it is questionable
> >whether the advice to alter the initrd on the SD card need be followed.
> >Perhaps it was necessary for the Ubuntu kernel at the time the article
> >was written.
> 
> Not the kernel, but the default initramfs.

Indeed.

> I seem to remember reading a recent post reporting that a SD/MMC driver was
> missing in the default Debian initramfs.

Now fixed.
 
> >Debian would need to be installed to the SD card and the *same" Debian
> >installed to the USB stick.
> 
> Debian does not need to be installed on the USB stick. Only /boot and the
> boot loader.

Fair enough, but d-i is a quick, painless and friendly method to achieve
the same objective and keep stick and card in sync with updates.

-- 
Brian.

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#180973

Fromdeloptes <deloptes@gmail.com>
Date2017-05-13 14:10 +0200
Message-ID<tGE1Y-3s7-21@gated-at.bofh.it>
In reply to#180968
Brian wrote:

> it will work for Debian. The answer is "probably" but it is questionable
> whether the advice to alter the initrd on the SD card need be followed.
> Perhaps it was necessary for the Ubuntu kernel at the time the article
> was written. The hardware involved would have to be known to more
> definitive.

It will work definitely the same way as it is described in this Ubuntu
artice.
As the article states, if your laptop can boot from SD no work is needed.
If it works or not, you'll find right after you reboot ;-)

> 
> Debian would need to be installed to the SD card and the *same" Debian
> installed to the USB stick. lsinitramfs will help confirm whether needed
> modules are in an initrd.

Not the same debian - you can install on the SD card and move or copy just
the boot directory to the usb, so that grub and pre init can do the work.

regards

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#180978

FromBrian <ad44@cityscape.co.uk>
Date2017-05-13 14:30 +0200
Message-ID<tGElj-3yW-9@gated-at.bofh.it>
In reply to#180973
On Sat 13 May 2017 at 14:09:09 +0200, deloptes wrote:

> Brian wrote:
> 
> > it will work for Debian. The answer is "probably" but it is questionable
> > whether the advice to alter the initrd on the SD card need be followed.
> > Perhaps it was necessary for the Ubuntu kernel at the time the article
> > was written. The hardware involved would have to be known to more
> > definitive.
> 
> It will work definitely the same way as it is described in this Ubuntu
> artice.

Now that we know the OP's machine has a Ricoh card reader I agree
"probably" could be raised to "definitely". But the palaver of
altering an initrd is still unnecessary.

> As the article states, if your laptop can boot from SD no work is needed.
> If it works or not, you'll find right after you reboot ;-)

His machine cannot boot from an SD card.

> > Debian would need to be installed to the SD card and the *same" Debian
> > installed to the USB stick. lsinitramfs will help confirm whether needed
> > modules are in an initrd.
> 
> Not the same debian - you can install on the SD card and move or copy just
> the boot directory to the usb, so that grub and pre init can do the work.

I got carried away. :)

-- 
Brian.

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